Question about Cars & Trucks
Not necessarily . You may need a new heater control ( tap ) so that the hot water can flow through the core of the heater. The core fins can be cleaned out with a vacuum cleaner.
Posted on Jan 03, 2014
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Posted on Jan 02, 2017
See my posted question under 2001 Mercury Villager: "HEAT BLOWS COLD WHEN CAR IS IDLING" I got an answer from chuck943 about air pockets and it was very helpful.
Posted on Feb 25, 2009
Have you checked the coolant level? What you describe is exactly what happens if the coolant level is low. When stopped at idle, hot coolant is not circulating through the heater core, so no heat. As the engine increases in rpm's when you pull away from the light, the water pump is spinning quicker, and some coolant is making it to the heater core. So check the level, and if it is low, keep an eye on it to see if it drops again. That of course indicates a leak somewhere. Get it fixed, as overheating the engine leads to costly repairs and worse case a new engine. Let me know how you make out with this.
Posted on Dec 05, 2009
Testimonial: "Thanks Curt! You were right ON!"
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